Bisping has yet to beat a top ten fighter in his entire career. He lost his last fight. There was no robbery about it, it was a clear win for Chael Sonnen. He's been fed mostly cans and declining fighters his entire career. When he fights top fighters, he loses. The Rashad, Chael, and Wanderlei fights were close, but he still lost. He had to cheat to beat Jorge Rivera, beat a strung out Chris Leben, an overhyped and undersized Akiyama, and an undersized journeyman in Dan Miller. None of those fighters have ever been ranked inside the top ten.
I really don't know what Bisping is whining about, but England's finest has always been a whiner so it doesn't surprise me.